Stable production with minimal fluctuation in gas/liquid ratio(GLR)is critical when designing gas-lift systems for subsea applications. Subsurface gas-lift equipment must last the life of the well, and the unloading and operating prodedures minimize erosion of the gas-lift valve and orifice. Dynamic modeling was used to determine the optimum orifice size for long-term operability over a range of injection rates, water cuts, and productivity indices. Also, the model was used to develop start-up procedures that minimize erosional effects on the downhole orifice and help answer questions regarding cyclic-production pressures at the subsea wellhead.
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